Lifting-jack



(No Model.)

` A. L. STANFORD.

LIFTING JACK.

' No. 513,155. Patented Jan. 23, ,1894,

"Ilm" l '5' I iesaes.' 2 vzwenr:

we NATIONAL Lrrnosnnruma cnMPANY i UNITED STATES 'PATENT OE-EICE.

ARTHUR L. STANFORD, vOF EVANSTON, ILLINOIS.

LIFTINGFJACK.

.SPECIFICATION forming part of Letters Patent No. 513,155, dated January23, 1894.

.Applicationiiled July 27,1893. SerialNo.481.663. No model.)

T0 all whom tm/ty con/cern:

Be it known that I, ARTHUR L. STANFOED, of Evanston, Cook county,Illinois, have invented a new and useful invention, being an Improvementin Lifting-Jacks, of which the following is a suficient speciication,reference being had to the accompanying drawings.

My invention consists in the construction of the various parts, and ofthe arrangement and combination thereof, as hereinafter fully de.scribed.

The object of my invention is to provide a lifting jack of simpleconstruction'well adapted to lifting railroad cars and for otherrailroad uses. j

In the drawings Figure 1 is a side elevation of my improved liftingjack, a portion of the standard A being broken away to expose ratchetwheel E and other parts. Fig. 2 is a sectional view on the line @om ofFig. 1, showing also in outline the base of the jack. Fig. 3 is asectional view of the lifting jack lever which I employ, and also showsin part my novel skeins for controlling the lifting pawl G. Fig. et is asectional view on the line y y of Fig. 1, showing also 1a longitudinalsection of Fig. 3.

A is the frame or standard. This is provided with a broad base, asapp'ears'in Fig. 2, to render the machine stable. The standard has acentralslot in which the lifting bar B operates, and is enlarged at itsupper portion to receive the operating mechanism. Lifting bar B'withinthe slotted standard is provided with foot B and cap B 5 and said'bar Bhas a series of cogs as appears in Fig. l, which mesh with and arecontrolled by the pinion D. Integral with pinion D are the roundbearings D Dthe heXagon portion DV and the journals D D. s

Eis a ratchet wheel, and C is the socket for the actuating lever C C.Pinion D is provided with round extensions on which is mounted leversocket C; and-ratchet wheel E is mounted upon the hexagon portion of thesame extension from pinion D. The jour-4 nals D D are preferably formedintegral with the pinion D and its extended portion. Ratchet wheel Ebeing rigidly,l mounted is controlled by the lifting pawl G, which isadapted to operate within the lever socket C C; said lever socket havingits arms journaled upon the round portion of the extension from thepinion D.

Retaining pawl G is forced to engage with ratchet-wheel E by spring H;and said pawl is disengaged from ratchet-wheel E by the wire W withinthe two halves of the lever C C. Wire W being attached to pawl H is alsoattached to rivet .I ,and passes through hand piece T as appears in Fig.3. Hand piece T is movable nearly the entire length of lever C C, andcan anywhere be made available to disengage pawl H through the medium ofwire W.

I is the retaining pawl pivoted to the standardJ and adapted to engagethe ratchet-wheel E, and provided with an extension as shown. Lever`socket C is located directly beneath the extended portion of pawl I, andby this construction the lever can be utilized to forcibly disengage thepawl I when jack is loaded; the pawl G having rst been disengaged.

It is immaterial whether the openings'in the sides of the enlargedportion of the standard A which receive and support the journal boxes Fwhich contain the journals D', be merely circular openings, or whetherthese be made in the form of a yoke and open at the top as appears inFig. 2l; save that if .the latter form be adopted the pinion D may beformed integral with the projecting journals D', whereas if the formerconstruction be used the pinion D and journals D must be formed separateto admit these parts to place in the machine.

The operation of the jack in lifting a load will be readily understood;downward motion of the actuating lever revolves ratchet-wheel E andpinion D through the medium of the pawl G7 and thus the lifting bar B israised.

The loaded bar B islowered slowly as follows:-

Support the loaded bar with the lever-depressed, then release theretaining pawl and allow the bar to descend somewhat; then allow thepawl I to support the weight, disengage pawl G, and depress the lever,repeating the operation. To precipitate the loaded bar B disengage thepawl G with the hand piece T; then raise the lever C and lever socket Cuntil the lever socket comes in contact with the extended portion ofpawl I when same may be forcibly disengaged and the lifting bar Bdropped and the load thus precipitated as is frequently' desirable inrailroad work..

Having thus described my invention, I claim as new and desine to secureby Letters Patentn 1. A lifting jack comprising a standard, aratchet-wheel, am actuating lever, andi' a retaining pawl pivoted to thestandard Vabove the actuating-lever in position to by gravity engage theratchet-wheel and also to be disengaged by the lever in the `upwardmove. ment of, the. latter.

2. I'n a lifting jack the combination of a standard, a lifting bar,aleverV socketw'tliiam actuating lever, a pinion engaging said li'ft- 1ing, bar, a ratehet-wheed, a lifting and' a re.- 4 taining paw-l adaptedtofact uponv said ratcheis-Wheel; saidiever socket being bifurcatedto?receive?.tliimvitchetfwlmehhoilowte` contain the liftingpawLandmounted upon the ex- 2o tended portion of said pinion, substantially "asser forth.

3. A lifting jack comprising a standard, a

yrack-bar, a* pinion, a ratchet-wheel, a hollow lever, a pawl in saidlever, a spring operating z 5 g to, thnow the pawl into engagement withthe "ratchet-wheel, a wire attached to the outer end of the pawl, and ahand-piece slidable on the wire for operating it. to retract the pawl.

ARTHUR L.' STANFORD.

Witnesses: i

LOUISA G.A Scannen, MARY El STANRQRD.

